Scaffold



M. OSTROSKE.

SCA'FFOLD.

APPLICATION FILED MAR. 14, 1918.

Patented Aug. 10, me.

J 1. Ostroski H. SJM

UNITED STATES MICHAEL OSTROSKI, OF CONISTON, ONTARIO, CANADA.

SCAFFOLD.

Application filed March 14,

To all whom 2'23 may concern:

Be it known that I, llblICHAEL Os'rnosnr, a subject of the King of Great Britain, residing at Coniston, Province of Ontario, Dominion of Canada, have invented a new and useful Scaffold; and I do hereby declare the following to be a full clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to a sec tional and knock-down scaffold which is adapted for use in the erection of all kinds of buildings and structures, the d vice en1 bodying novel features of construction whereby it can be assembled in such a manner as to meet the requirements of any conditions which may be encountered in ordinary practice.

Further objects of the invention are to provide asectional scaffold which is comparatively simple and inexpensive in itsconstruction, which can be easily and quickly assembled or taken apart, which provides a rigid and safe construction, and which can be used in connection with both large and small pieces of work.

With these and other objects in view, the invention consists in certain novel combinations and arrangements of the parts as will more fully appear as the description proceeds, the novel features thereof being pointed out in the appended claims.

For a full understanding of the invention, reference is to be had to the following description and accompanying drawings, in which Figure'l is an end view of a portion of a scaffold constructed in accordance with the invention.

Fig. 2 is a side elevation of the lower portion thereof.

Fig. 3 is a horizontal sectional view on the line 3-3 of Fig. 1, showing a portion of the platform.

Fig. 4 is a transverse sectional view through the platform on the line 4-4 of Fig. 3.

Fig. 5 is an enlarged sectional view on the line 5-5 of Fig. 1, showing the manner of securing the lowermost upright unit to the base.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

Specification of Letters Patent.

Patented Aug. 10, 1920.

1918. Serial No. 222,419.

The upright members of the scaffold are formed by assembling a series of upright units 1 in a superposed relation to each other, the number of units employed depending upon the height to which the scaffold may be carried. Each of the upright units 1 is provided at its lower end with a foot plate 2 and at its upper end with a head plate 3, the foot plate 2 of each upper unit being designed to rest upon the head plate 3 of the lower unit and to be secured thereto by bolts l, said bolts passing through corresponding openings in the two plates. The ends of the head plate 3 preferably returned upwardly at 3* so as to fit around the edges of the foot plate 2 of the super posed unit thereby holding the superposed upright securely in position even though the bolts may become loose.

The bottom of the lowermost unit 1 is secured to a base 5, said base being provided with flanged strips 6 which fit over the edges of the foot plate 2 and having the ends thereof bent upwardly and inclined to provide braces 7 which en age the sides of the upright 1 and are secured thereto by a trans verse bolt 8 w rich passes through a suitable open ng in the upright. The base 5 provides an extended bearing surface for engagement with the ground, and the bolts 9 which secure the foot plate 2 of the upright l to the base may be of sufiicient length to pass through the base and engage spurs 10. lVhen the scaffold is supported upon a dirt foundation, these spurs will prevent slipping at the base thereof. However, if the scaffold is erected upon concrete, the spurs 10 may be omitted and short bolts 9 employed.

Each of the upright units 1 is provided with a series of brackets 11 which project laterally upon opposite sides of the upright and are preferably adjustable thereon so as to be set at difierent elevations. In the present instance the brackets 11 are shown as slidable upon the uprights and as each provided with a pair of openings 12 adapted to be brought into registry with any selected set of notches 13 in the edges of the upright. Each of the brackets is also provided with an upstanding ear 11 which is provided with a perforation l l adapted to register with any selected one of the openings 15 in the upright. Brace strips 16 are employed to secure the uprights to adjacent parts of the building or other structuros so as to tie the scaffold to the building in the usual manner. In the present instance the brace 16 has a T-shaped formation, the transverse head thereof being provided with openings '17 by means of which it can be secured to the structure by suitable fastening members, while the other member is provided with openings 18, any

selected one of which can be engaged by a bolt 19 which also passes through one of the openings'12 of a bracket'll andengages one of the notches 13 0f the upright. V The bolt 19 thus serves to secure the members to the bracket and to lock the bracket in an adjusted position upon the upright. These braces 16 can be used wherever it is found necessary to tie or connect the scaffold to the buildin 7 The platform is shown as formed of a series of boards 20 which have theextremities thereof fitted in corresponding sockets in cross heads 21. Removable pins 22 pass through the cross head and engage the ends ofthe boards 20 to prevent the boards from pulling out of the sockets and becoming disengaged from the cross head. The cross head 21 is provided with rearwardly projecting wings 23 which are spaced apart so as to straddle the upright 1 and rest upon elevation thereon.

the projecting ends of one of the brackets 11; A bolt 24: passes through the ear 11 of the said bracket and one "of the openings15 of the upright, said bolt also engaging the cross head so that it serves both to hold the bracket in an adjusted position and to secure a small or a large scaffold, and to be arranged in such a manner as to meet any of the conditions which are encountered in ordinary building practice.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is

1. A sectional scaffold including similar and interchangeable upright units, each of which is provided'at the bottom with a fiat foot plate and at the top with a corresponding head plate, fastening members connect-- ing the foot plate of one upright unit to the head plate of another upright unit, brackets projecting from the uprights, a cross head constructed to engage one of the brackets, and a platform mounted upon the cross head. 7

2. A sectional scaffold including similar and interchangeable upright units, each of which is provided at the bottom with a flat foot plate and at the top with a corresponding head plate, opposite edges of the head plate being returned to fit over the foot plateof a superposed unit, fastening members for connecting the head plates and foot plates of superposed units, a platform, and means .for mounting the platform upon the upright units.

3. A sectional scaffold including similar and intechangeable'upright units, each of which is provided at the bottom with a flat foot plate and at the top with a corresponding head plate, means for securing the head plate of one unit to the foot plate of a superposed unit, a base plate arranged under the foot plate of the lower unit, removable spurs for the base plate, and fastening members securing the foot plate of the lower unit to the base plate and also engaging the spurs. V r

In testimony whereof I have signedmy name to this specification in the presence of two subscribing witnesses MICHAEL OSTROSKT. Witnesses V EILEEN FRAWLEY, MYRTLE CAHooN. I 

